Drying or roasting apparatus or the like.



H. Lb'F uisT. 'DRYING 0R ROASTING APPARATUS OR THE LIKE.

, APPLICATION FILED JULY 28,1914- 1,151,203..

Patented Aug. 24, 1915.

2 SHEETS-SHEET I.

H. LUFQUIST.

DRYING 0R ROASTING APPARATUS OR THE LIKE.

APPLICATION 'FILED JULY 28,1914.

1,151,203. Q Q Patented Aug. 24, 1915.

2 SHEETS-SHEET 2.

HJ'AIMAR LfiFQU'IST, 0F STOCKHOLM, SWEDEN.

DRYING- OR ROASTING APPARATUS OR THE LIKE.

Specification of Letters Patent.

Patented Aug. 24, 1915.

Application filed July 28, 1914. Serial No. 853,734.

To all whom it may concern:

Be it known that I, HJALMAR Lor UIsT, a subject of the King of Sweden,residing at 21 Birger Jarlsgntin, Stockholm, Sweden, have invented newand useful Improvements in Drying or Roasting Apparatus or the like, ofwhich the following is a specification.

This invention relates to improvements in apparatus for drying moistcereals, roasting coffee and similar purposes.

The present invention is principaly distinguished by the feature thatthe drying or roasting takes place in a drum that is adapted to rotatecontinuously or to oscillate around a horizontal shaft and is providedat its periphery with longitudinal hollow webs in which electricalheating elements are placed.

The invention also comprises an automatic cut-out device for saidheating elements, which acts as soon as the drum is stopped, for thepurpose of preventing a burning of the material therein.

A preferred form of the invention is illustrated in the accompanyingdrawings in which:

Figure 1 is a central vertical longitudinal section of the apparatus,Fig. 2 is a central cross section and Fig. 3 shows a diagram of theelectrical connections of the apparatus.

In bearings 1 in a frame 2 a drum 3 rests by means of journals 4 whichpreferably should be hollow, so that air can be blown or drawn throughthe drum by means of a fan 5. Over the periphery of the drum there isdistributed a number of hollow webs 6, in the form shown six areemployed, consisting of angularly bent plates and containing electricheating elements, such as resistance wires 7 wound on cores 8 ofcrosslike cross section. The current is supplied to these elements bymeans of a pair of contact rings 9 arranged on one end wall of the drum,brushes 10 bearing against said rings.

In the form shown, a reciprocatory tuming movement is given to the drumby means of a mechanism of a known kind. As before mentioned, the drummay, however, be

continuously rotated in the same direction if desired.

The manner of operation of the drum will be understood without furtherdescription. The roasted or dried material is most easily discharged byturning the drum into such a position, that an opening normally closedby a sliding doorll is turned downward, then by opening the sliding door11 the material falls down through a hopper 12.

Fig. 3 shows how the electrical parts of the apparatus are connected forpreventing the current from remaining on the heating elements, if themotor should stop, which might cause the burning of the material. 14 isthe armature, 22 the magnet winding and 15 the starting resistance ofthe motor. 16 are the heating elements which are connected in parallelwith the motor to the mains 17. In the circuit of the motor as well inthat of the heating elements there is inserted a minimum current cut-out18, 19 respectively, the two electromagnets 20, 21 of said cut-outs areconnected in series with each other, with the starting resistance andwith the magnet winding 22. Thus if the starting device of the motorshould return to cut-out position (as shown in Fig. 3) bothelectromagnets 20, 21 will be without current so that the heatingelements will also be cut out.

Having now particularly described the nature of my invention and themanner of its operation, what I claim is:

1. In drying or roasting apparatus, a drum rotatable around a horizontalaxis and having a single wall, longitudinal hollow webs on the innerside of the peripheral wall of said drum and projecting therefrom so asto serve as agitators for the material contained in said drum, electricresistance elements contained in said webs and means for rotating saiddrum.

2. In drying or roasting apparatus, a drum rotatable around a horizontalaxis and having a single wall, longitudinal h0l low webs on the innerside of the peripheral wall of said drum, electric resistance heatingelements contained in said webs, an electric motor in driven, connectionto said drum, a starting controller for said motor, name to thisspecification in the presence of aild a mjnimluli out out for saidresiitanfie two subscribing witnesses. eements inc-11 ing an operatingcoi, t e operating coil of said out out being oonnect- F HJALMARLOFQUIST' 5 ed in series with the starting controller of Witnesses:

the motor. BmGnR NORDFELT,

In testimony whereof I have signed my 1 GICTA PRIEN.

